399 美元的 Apple G4 iBook 整修品值得買嗎？

規格如下

Mac OS X 10.5 installed
PowerPC G4 1.33 GHz processor
1 GB DDR RAM (supports up to 1.5 GB)
40GB hard drive
Slot-loading CD-RW/DVD-ROM drive
ATI Mobility Radeon 9550 Graphics w/32 MB of DDR SDRAM
Integrated audio with built-in speakers
Integrated 56K V.92 modem
Integrated 10/100Base-T Ethernet
AirPort Extreme Wireless card (Wi-Fi 802.11g) pre-installed
Built-in Bluetooth 2.0 + EDR
Keyboard with Touchpad
12.1-inch TFT XGA LCD display (1024 x 768 resolution)
AC adapter (Input: 100 - 240V, 56/60Hz, 1.2A / Output 24V, 1.875A

Warranty: 30 Days

如果值得買的話，請問加 RAM 和 換 hard drive 容不容易？還有這台機器可裝雪豹嗎？